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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbae561304d3bd09ee246c12d84df3e940f00e38fcdefced435b15029ce6f5a' 
  AND token = 'kJzmCqiDt2vaakD/E1WfedNiWIld0zzSdPHMTe+yIDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}